Spirit-level.



i. WIl MASON ,SPIRIT LEVEL.

APPucAHoN FILED Nov. s,y 1914.

'Lls v Pamdsgpn 28, 1915.

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' Witnesses N neys - .f invrneffwf ransom] To (MZ whom it may concern: .f

Be it known that I, IRVINGW. MASON, a

'citizen of the United States, i residing at Aberdeen, inthe county of Chehalis vand State of l/Va'slfiington, have invented a new and useful Spirit-Level, of which the following is a speciiication.

' This invention relatessto spirit levels and more especially to means whereby the position of the bubble within the vial in the level can he readily determined when the level is supported at a point above the usery and where, under ordinary circumstances, it

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would be necessary to climb upon a ladder or other support in order to look down ,upon 'the vial.

A further object is to provide means for use in connection with a level of standard make whereby the position of the bubble can be determined by looking upwardly at i the level.

A' further object is to provide an attachment 'which is simple iii-construction, can be readily applied, and which will accurately and clearly disclose the position of the bubble.

Vif ith the. foregoing and other objects in view which will appear as the description' proceedsthe invention resides in the combination and arrangement of partsand in the details of construction hereinafter dev scribed and claimed, it being understood that changes in the preciseembod'ment of the invention herein` disclosed, can be made within the scope of what 1s claimed, without departing from the spirit of the invention.`

In the accompanying drawings the prefer-red form of the invention has been shown.

In said drawings, Figure 1 is a side elevationof a portionfof a spirit level having the present improvements combined there- 'with Fig. 2 is a perspective View of the attachment. Fig. 3 is -a transverse section through the spirit level, said section being taken on the line A B Fig. 1. Fig. 4 is a side elevation of a portion of a spirit level vhaving a modified-form of attachment. F ig.

.the body of the .spirit level.

5 is a section on line C-D F ig. 4. d

Referring to the figures by characters of reference l designates a splrit level of thev Sta-nleyl" type wherein the vial 2 is sup-V ported within an opening 3 formed within The vattachment constituting-fthe present invention 1s adapted to beplaced within this opening v5peeilieatioli' of Letters Patent;

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srrnrnnnvisrlfiia l i 'i Patented Sept. 1915.

appueation med November e, 1914. serial No. 870,628.

and directly opposite the vial and includes a holder made up of a'flat strip 4having its '-sides turned inwardly as at 5, thus to form opposed guide channels 6. Longitudinal iianges 7 extend from the inturnedsides 5 andare spaced apart a sufficient distance to receive between them the body of the level, as shown particularly in Fig. 3. .These ilanges 7 are so disposedthat, when they are 1n proper position in engagement with the 'body of the spirit level, they supportthe plate or strip 4 in an inclined position. This strip 4 has an elongated opening S 'and supported by the strip 4 and with its edge portions seated in the channels 6, is a mirror -9. The opening 8 is located directly opposite the exposed portion of the vi'al 2 vso that, when the bubble becomes visible, the reflection thereof will appear within .the mirror. Spring arms l0 are formed integral with the en'd portions of the strip 4 and areprovided with feet 11 which are bowed transversely so as to lit snugly upon the end portions of the Avial holder 12 mounted in the opening 3. The spring arms 10 thrust the attachment upwardly or outwardly against the Wall of the body l of the spirit level so that afterthe attachment has once been placed Within the opening 3, it will not become accidentally displaced.

It will be apparent that when a spirit level is provided with an attachment such as described, the same can be placed upon al structure located above the level of the eye of the user and by glancing upwardly into A the exposed portion of the mirror 9, the user can determine readily the position' of the bubble relative to the center of thevial.

Instead of mounting the attachment upon yielding supports such as the arms 10, said attachment can be mounted at its ends upon threaded posts 13 as-shown in Figs. 4 and 5 and in this construction the shoulder 14 provided for the mirror-15' is preferably formed in a single casting instead of sheet metal. Each of the posts 13 has a head 16 whereby it can be readily screwed into or unscrewed from the vial holder 17, thus to shift the mirror holder away from or tofward the vial.

Obviously various other changes can be made in the, construction and arrangement of the partsniwithout departing from the spirit of the invention. For example, an

attachment such as described can bey applied readily to the transverse or plumb vial aswell as to a longitudinal vial such as shown. This construction is so obvious that it is notdeemed necessary to illustrate the same. What is claimed is 1. The combination with a spiritlevel, of a. holder adapted to straddle a portion of the body of the spirit level, means for binding said holder against a portion of said body,.,and a mirror supported by the holder directly opposite the vial ofthe spirit level.

2. An attachment for spirit levels, ncluding a holder, means thereon for straddling a portion of the body of the spirit level, a

mirror supported by the holder, there being IR VING W. MASON.

Witnesses:

T. H. MCKAY, J. B. ELSTRY. 

